Malicious PDF — malware analysis report

Static analysis result for SHA-256 288c18785a2750d3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 23:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 86b04bc8a33a4b19f69af0dcefc12907 SHA-1: 34fcccea3f67aeb283b11b8c880bc5b2e1b2155d SHA-256: 288c18785a2750d3935335308c920e1ae8f959de961b2ff11370d9881cb91a77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=aggregate+demand+and+supply+worksheet+answers PDF link annotation
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a442fba9a1---gegipikukosi.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/faxot.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nagb0gpdrdfs1j6sriavu04iuh/91969479089.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/rufaxusogavuxof.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/tenerepu.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/16898254096.pdfIn PDF document text
    • http://jarosi.hu/files/file/2384310259.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f1b9a9a36a7df521104aa5eb8fc9ec98/vovufujawiko.pdfIn PDF document text
    • http://iwishop.hu/file/niduzeneruz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dccc85b29---63618550313.pdfIn PDF document text
    • https://tigaintan.com/contents//files/99137413289.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/99106967739.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb050a37a68---88003835474.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/joxigaremizufag.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/mibupire.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/verivoranagefimoza.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/nefalebitafowuruxugopukux.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/wojiwizawewenasofavafi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c6a4f09---lenazulopofakanoza.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/65939025488.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a66db52eb4---sibivuno.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/01ee4a06eeaf0f2c6b8b9be2eda221ab/sepopave.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/57449559488.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0d900c2db48de773d226907b036ed22f/48815395608.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/bivejetali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE59 16256 bytes
SHA-256: fefdfe374feb3db210a94440e9f9940f281072d9897b0e76d9346aff8968d9b4
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 11120 bytes
SHA-256: aee6c15857846ae3961f34317c05b8989328fa5cb153570beabaeae76fef3b95

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